zig

commit 332d632ccceb65d2b28cceee740d794d6d7c4c2a (tree)
parent 122e0c26f23e765d91f0ff15533aeac2f4bc8f65
Author: Kendall Condon <goon.pri.low@gmail.com>
Date:   Wed, 22 Apr 2026 20:53:33 -0400

collect all stderr on fuzzing crash

Diffstat:
M
lib/std/Build/Step/Run.zig
 | 
10
+++++++---

1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/lib/std/Build/Step/Run.zig b/lib/std/Build/Step/Run.zig
@@ -2166,11 +2166,15 @@ const FuzzTestRunner = struct {
                 const result = completion.result;
                 switch (completion.index % 3) {
                     0 => try f.completeStdinWrite(id, result.file_write_streaming catch |e| switch (e) {
-                        error.BrokenPipe => return f.instanceEos(id),
+                        // Avoid calling `instanceEos` until EndOfStream is seen with stderr so
+                        // that all stderr is collected.
+                        error.BrokenPipe => continue,
                         else => |write_e| return write_e,
                     }),
                     1 => try f.completeStdoutRead(id, result.file_read_streaming catch |e| switch (e) {
-                        error.EndOfStream => return f.instanceEos(id),
+                        // Avoid calling `instanceEos` until EndOfStream is seen with stderr so
+                        // that all stderr is collected.
+                        error.EndOfStream => continue,
                         else => |read_e| return read_e,
                     }),
                     2 => try f.completeStderrRead(id, result.file_read_streaming catch |e| switch (e) {
@@ -2480,7 +2484,7 @@ const FuzzTestRunner = struct {
         const step_owner = f.run.step.owner;
         const arena = step_owner.allocator;
 
-        // Collect any remaining stderr
+        // Collect any available stderr
         while (f.batch.next()) |completion| {
             if (completion.index % 3 != 2) continue;
             const len = completion.result.file_read_streaming catch continue;